The book has tons of celeb fans like Taylor Swift, Kris Jenner, and Paula Abdul. The Secret Language shares all about who you are, why you do the things you do, and your compatibility with others based on your birth date.

So since Jennifer Aniston is 44 today we couldn't resist finding out what her birthday reveals about her.

Jen has a lot to celebrate this year. The Emmy-winning actress is planning her wedding to fiancé Justin Theroux and she seems happier than ever.

According to the book, February 11 is the day of improved comfort. The co-author Tom Rezek tells OKMagazine.com, "Jen loves being surrounded by the finer things in life: exquisite food, a luxurious home and someone to share it with. She’s also very passionate about improving the comfort of others, as we’ve seen with her support of St. Jude’s Children’s Hospital."

In addition, "she's also born during The Week of Acceptance which means Jen has a kind and open heart and will always fight for the underdog! The only thing she really has to watch out for is sticking her nose in other people's business. She can be a little over involved and excessive at times."

The book is now available online and you can click here to check it out!

Happy Birthday Jennifer! Have birthday wishes for her? Tweet them to us @OKMagazine